K Series Chassis/1U Flex ATX Power Supply/Front I/O USB & Type-C Port/Vented Panel 2 Steel & 1 Acrylic Side Panels/Two Types of Handles/SFF Gaming Case (K39BLK)
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AI Verdict
This 5.1L Mini ITX chassis, constructed from 1.5mm steel, is for builders prioritizing extreme portability with specific FLEX-1U PSUs and compact GPUs.
Its 5.1L volume and 1.5mm steel construction make it highly portable and durable for specific SFF builds. However, the strict 185mm GPU length, 43mm CPU cooler height, and FLEX-1U PSU requirement significantly narrow its component compatibility.
If you need more component flexibility, look for cases supporting standard ATX PSUs, GPUs longer than 200mm, and CPU coolers taller than 60mm.
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Pros
- Ultra-compact 5.1L volume, measuring 7.7x4.7x8.7 inches, fits backpacks or desk corners.
- Durable 1.5mm steel construction with an anti-vibration design for internal components.
- Includes both vented steel and a 3mm acrylic replacement side panel for hardware visibility.
- Front I/O features USB 3.0 and Type-C ports for high-speed transfers.
- Supports two 2.5" SSD/HDD bays with anti-vibration mounts for expandable storage.
- Designed for natural convection cooling, eliminating the need for extra case fans.
Cons
- Requires a FLEX-1U PSU, which can be noisy and may necessitate fan modification for quiet operation.
- GPU length is limited to 185mm (or 195mm with included standoffs) and 40mm height, restricting component choice.
- CPU cooler height is strictly limited to 43mm, requiring a low-profile solution.
- An 18.5cm Dual Reverse Connectors PCIe riser cable is required for GPU installation and is not included.
- Assembly is not recommended for novices and can be challenging for first-time SFF builders.
Dimension Scores
The natural convection cooling design is average for a 5.1L case, but the 43mm CPU cooler height limit restricts high-performance cooling solutions.
While the case itself is fanless, the required FLEX-1U PSUs are frequently reported to be noisy, often requiring user modifications for quieter operation.
The chassis is crafted from durable 1.5mm thick steel and includes both steel and 3mm acrylic vented side panels.
The extremely compact 5.1L volume makes cable management challenging, though some users found it manageable with careful planning.
Best For
- Portable gaming rigs that need to fit into a backpack.
- HTPCs (Home Theater PCs) where a minimal footprint is crucial.
- Space-saving office setups where desk space is limited.
- Experienced SFF builders who enjoy the challenge of optimizing compact systems.
Not Recommended For
- First-time PC builders due to complex assembly and specific component requirements.
- Users requiring high-performance, full-size GPUs or tall CPU coolers.
- Anyone prioritizing silent operation without planning for PSU fan modifications.
Watch Out For
- You must set the motherboard BIOS PCIE speed to GEN3 for the 3.0 graphics card extension line to function, or the system will not work.
- The front panel has been reported to bend during the assembly process.
- Cable management can be difficult due to the extremely limited internal space, despite some users finding it manageable.
- The required FLEX-1U power supplies are often noisy, with users frequently needing to swap out the stock fan for a quieter alternative.
Full Specifications
| ASIN | B0G5Y3LRNM |
| Brand | SGPC |
| Color | black |
| Series | K39BLK |
| Case Type | Slim-Desktop |
| Model Name | K39BLK |
| Item Weight | 4.5 pounds |
| Manufacturer | SGPC |
| Cooling Method | Air |
| Item model number | K39 Black |
| Product Dimensions | 7.68 x 4.72 x 8.67 inches |
| Item Dimensions LxWxH | 7.68 x 4.72 x 8.67 inches |
| Number of USB 3.0 Ports | 2 |
| Motherboard Compatability | Mini ITX |
| Power Supply Mounting Type | Bottom Mount |
| Recommended Uses For Product | Business, Gaming |
What Buyers Say
Many users highlight the extremely compact 5.1L size, making it suitable for portable builds that fit into backpacks. The requirement for a FLEX-1U PSU is a recurring point, with users often discussing the need to mod these PSUs for quieter operation. While the 1.5mm steel construction is appreciated, some builders report challenges with the assembly process and GPU compatibility due to strict dimension limits.
“Man, this thing is tiny, but getting everything to fit was a puzzle, and that PSU fan sounds like a jet engine, gotta swap that out ASAP.”
Common Praise
- Ultra-compact 5.1L volume (7.7x4.7x8.7 inches) makes it highly portable.
- Durable 1.5mm steel construction provides a sturdy frame.
- Includes both vented steel and a 3mm acrylic side panel for aesthetic choice.
- Front I/O with USB 3.0 and Type-C ports offers modern connectivity.
- Ideal for creating a very small, portable gaming rig.
Common Complaints
- FLEX-1U PSUs are often noisy and require fan swaps for quieter builds.
- Strict GPU length (185mm/195mm) and height (40mm) limits component selection.
- CPU cooler height is severely restricted to 43mm.
- The necessary PCIe riser cable is not included and must be purchased separately.
- Assembly can be difficult, especially for those new to SFF building.
Ownership Tips
- The included optional handles (one plastic, one leather) enhance its portability.
- Setting the motherboard BIOS PCIE speed to GEN3 is a critical step for the riser cable to function correctly.
- The acrylic side panel allows for a clear view of internal hardware without needing additional modifications.
- Finding a suitable and quiet FLEX-1U PSU can be a significant part of the build process.
- Even with natural convection, careful selection of low-heat-output components is important to prevent overheating in the compact 5.1L volume.
Frequently Asked Questions
What kind of power supply does the K39BLK require?
It requires a FLEX-1U power supply, which is a specific compact form factor.
What is the maximum GPU length supported by this case?
The case supports GPUs up to 185mm in length. This can be extended to 195mm if you use the included hexagonal brass standoff screws to raise the side panel.
What is the maximum CPU cooler height I can use?
You can use CPU coolers up to 43mm in height.
Does the case come with a PCIe riser cable for the GPU?
No, an 18.5cm Dual Reverse Connectors Riser Cable is required for GPU installation and must be purchased separately.
Is this case suitable for a first-time PC builder?
It is not recommended for novices due to the challenging assembly process and specific component requirements. It's advised to watch online build videos before purchasing.
Buying Guide
When looking at mini-ITX cases like this 5.1L chassis, you're trading size for component flexibility. Every millimeter matters for your CPU cooler, GPU, and even power supply. Don't expect to just drop in any parts; you'll need to carefully check dimensions against the case's limits.
Volume (5.1L)
This tells you how much internal space the case has. A 5.1L case is extremely small, meaning you'll need specialized, compact components that fit precisely, much like packing a very small suitcase.
FLEX-1U PSU
This is a specific, smaller power supply form factor. Unlike standard ATX PSUs, FLEX-1U units are often louder and have fewer wattage options, so you need to plan your power budget carefully, like choosing a compact engine for a small car.
GPU Length/Height (185mm/40mm)
These measurements are critical. Most high-performance GPUs are much longer and thicker, so you'll be limited to specific single-fan or low-profile models, similar to needing a very specific size of tire for a custom wheel.
CPU Cooler Height (43mm)
This is a very low clearance. You'll need a low-profile CPU cooler, which often means compromising on cooling performance compared to larger tower coolers, much like a low-profile car might have less ground clearance.
Alternatives
If you need more space for a longer GPU, a taller CPU cooler, or a quieter standard ATX power supply, search for SFF cases with volumes closer to 10-15 liters.
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